[test] This 'p' element should have no border applied to it, as it has been given a zero-width overall border (this helps keep the following tests more clear).

[test cl1] This 'p' element should have a thin right border.

[test cl2] This 'p' element should have a medium right border.

[test cl3] This 'p' element should have a thick right border.

[test cl4] This 'p' element should have a 5px right border.

[test cl5] This 'p' element should have no right border.

[test cl6] This 'p' element should have no right border, as negative border widths are not permitted.

[test] This 'p' element contains a 'span' element with a class of 'test cl4' that should have a 5px right border. If there is [test cl4]any increase of line separation in the 'p' element due to the border on the 'span' element, the test has been failed; borders do not affect the height of lines. However, the border may extend into or overlap other lines of text.